Ventilator blade



FIG. 1 is a perspective view of a ventilator blade showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is right view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a ventilator blade, as shown. 